Abstract: Using the climatic data of 1961-1980 the monthly mean air temperature maps are analysed by the "topographic smooth method" and the "altitude reducing method" in the Qi-Lian mountainous area. It is shown that the west part.of the mountain is cooler than the east part during the winter, and conversed in the summer. There is a "warm belt" surrounding the mountain between the 2000-2500m. a. s. 1.during the winter and the night time. The air temperature of the Qing-Hai lake is higher 1-2℃ than the surrounding areas at the winter time before the lake being frozen. In contrast with the "free atmosphere", the surface air temperature of the mountain is lower 10-15℃ in the winter's night time and higher about 5℃ in the summer's afternoon.